netfilter: nf_tables: set backend .flush always succeeds

jira VULN-835
subsystem-sync netfilter:nf_tables 4.18.0-534
commit-author Pablo Neira Ayuso <pablo@netfilter.org>
commit 6509a2e
upstream-diff - A conflict in nft_pipapo_flush resolved by
favoring the 4.18.0-0-534 tagged code.

.flush is always successful since this results from iterating over the
set elements to toggle mark the element as inactive in the next
generation.

	Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 6509a2e)
	Signed-off-by: Greg Rose <g.v.rose@ciq.com>

Conflicts:
	net/netfilter/nft_set_pipapo.c

Author: gvrose8192

include/net/netfilter/nf_tables.h

@@ -375,7 +375,7 @@ struct nft_set_ops {
 	void *				(*deactivate)(const struct net *net,
 						      const struct nft_set *set,
 						      const struct nft_set_elem *elem);
-	bool				(*flush)(const struct net *net,
+	void				(*flush)(const struct net *net,
 						 const struct nft_set *set,
 						 void *priv);
 	void				(*remove)(const struct net *net,

net/netfilter/nf_tables_api.c

@@ -5894,17 +5894,13 @@ static int nft_flush_set(const struct nft_ctx *ctx,
 			 struct nft_set_elem *elem)
 {
 	struct nft_trans *trans;
-	int err;
 
 	trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
 				    sizeof(struct nft_trans_elem), GFP_ATOMIC);
 	if (!trans)
 		return -ENOMEM;
 
-	if (!set->ops->flush(ctx->net, set, elem->priv)) {
-		err = -ENOENT;
-		goto err1;
-	}
+	set->ops->flush(ctx->net, set, elem->priv);
 	set->ndeact++;
 
 	nft_setelem_data_deactivate(ctx->net, set, elem);
@@ -5913,9 +5909,6 @@ static int nft_flush_set(const struct nft_ctx *ctx,
 	list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 
 	return 0;
-err1:
-	kfree(trans);
-	return err;
 }
 
 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,

net/netfilter/nft_set_bitmap.c

@@ -176,7 +176,7 @@ static void nft_bitmap_activate(const struct net *net,
 	nft_set_elem_change_active(net, set, &be->ext);
 }
 
-static bool nft_bitmap_flush(const struct net *net,
+static void nft_bitmap_flush(const struct net *net,
 			     const struct nft_set *set, void *_be)
 {
 	struct nft_bitmap *priv = nft_set_priv(set);
@@ -188,8 +188,6 @@ static bool nft_bitmap_flush(const struct net *net,
 	/* Enter 10 state, similar to deactivation. */
 	priv->bitmap[idx] &= ~(genmask << off);
 	nft_set_elem_change_active(net, set, &be->ext);
-
-	return true;
 }
 
 static void *nft_bitmap_deactivate(const struct net *net,

net/netfilter/nft_set_hash.c

@@ -194,14 +194,12 @@ static void nft_rhash_activate(const struct net *net, const struct nft_set *set,
 	nft_set_elem_change_active(net, set, &he->ext);
 }
 
-static bool nft_rhash_flush(const struct net *net,
+static void nft_rhash_flush(const struct net *net,
 			    const struct nft_set *set, void *priv)
 {
 	struct nft_rhash_elem *he = priv;
 
 	nft_set_elem_change_active(net, set, &he->ext);
-
-	return true;
 }
 
 static void *nft_rhash_deactivate(const struct net *net,
@@ -567,13 +565,12 @@ static void nft_hash_activate(const struct net *net, const struct nft_set *set,
 	nft_set_elem_change_active(net, set, &he->ext);
 }
 
-static bool nft_hash_flush(const struct net *net,
+static void nft_hash_flush(const struct net *net,
 			   const struct nft_set *set, void *priv)
 {
 	struct nft_hash_elem *he = priv;
 
 	nft_set_elem_change_active(net, set, &he->ext);
-	return true;
 }
 
 static void *nft_hash_deactivate(const struct net *net,

net/netfilter/nft_set_pipapo.c

@@ -1706,13 +1706,12 @@ static void *nft_pipapo_deactivate(const struct net *net,
  *
  * Return: true if element was found and deactivated.
  */
-static bool nft_pipapo_flush(const struct net *net, const struct nft_set *set,
+static void nft_pipapo_flush(const struct net *net, const struct nft_set *set,
 			     void *elem)
 {
 	struct nft_pipapo_elem *e = elem;
 
-	return pipapo_deactivate(net, set, (const u8 *)nft_set_ext_key(&e->ext),
-				 &e->ext);
+	nft_set_elem_change_active(net, set, &e->ext);
 }
 
 /**

net/netfilter/nft_set_rbtree.c

@@ -384,14 +384,12 @@ static void nft_rbtree_activate(const struct net *net,
 	nft_set_elem_change_active(net, set, &rbe->ext);
 }
 
-static bool nft_rbtree_flush(const struct net *net,
+static void nft_rbtree_flush(const struct net *net,
 			     const struct nft_set *set, void *priv)
 {
 	struct nft_rbtree_elem *rbe = priv;
 
 	nft_set_elem_change_active(net, set, &rbe->ext);
-
-	return true;
 }
 
 static void *nft_rbtree_deactivate(const struct net *net,